linux-kernel - Re: [PATCH v2] x86: Don't allow nr_irqs > NR

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Message-ID: <20081106062423.GB6384@elte.hu>
Date:	Thu, 6 Nov 2008 07:24:23 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] x86: Don't allow nr_irqs > NR_IRQS


* Ben Hutchings <bhutchings@...arflare.com> wrote:

> On some systems probe_nr_irqs() can return a value larger than 
> NR_IRQS.  This will lead to probe_irq_on() overrunning the irq_desc 
> array.
> 
> Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>

>  I hit this when running net-next-2.6 (close to 
> 2.6.28-rc3) on a Supermicro dual Xeon system.  NR_IRQS is 224 but 
> probe_nr_irqs() detects 5 IOAPICs and returns 240.  Here are the log 
> messages:

applied to tip/x86/urgent, thanks Ben!

	Ingo
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